Extract.fasp {spatstat}R Documentation

Extract Subset of Function Array

Description

Extract a subset of a function array (an object of class "fasp").

Usage

  ## S3 method for class 'fasp':
  x[I, J, drop=TRUE,...]

Arguments

x A function array. An object of class "fasp".
I any valid expression for a subset of the row indices of the array.
J any valid expression for a subset of the column indices of the array.
drop Logical. When the selected subset consists of only one cell of the array, if drop=FALSE the result is still returned as a 1 * 1 array of functions (class "fasp") while if drop=TRUE it is returned as a function (class "fv").
... Ignored.

Details

A function array can be regarded as a matrix whose entries are functions. See fasp.object for an explanation of function arrays.

This routine extracts a sub-array according to the usual conventions for matrix indexing.

Value

A function array (of class "fasp"). Exceptionally, if the array has only one cell, and if drop=TRUE, then the result is a function value table (class "fv").

Author(s)

Adrian Baddeley adrian@maths.uwa.edu.au http://www.maths.uwa.edu.au/~adrian/ and Rolf Turner r.turner@auckland.ac.nz

See Also

fasp.object

Examples

 # Lansing woods data - multitype points with 6 types
 data(lansing)
 
 # compute 6 x 6 array of all cross-type K functions
 a <- alltypes(lansing, "K")

 # extract first three marks only
 b <- a[1:3,1:3]
 ## Not run: plot(b)
 # subset pertaining to hickories
 h <- a[levels(lansing$marks) == "hickory", ]
 ## Not run: plot(h)

[Package spatstat version 1.16-0 Index]